import * as React from 'react';
export declare type removeCb = () => void;
export declare type MediumCallback<T> = (data: T) => any;
export declare type MiddlewareCallback<T> = (data: T, assigned: boolean) => T;
export declare type SidePush<T> = {
    length?: number;
    push(data: T): void;
    filter(cb: (x: T) => boolean): SidePush<T>;
};
/**
 * An object describing side medium
 */
export interface SideMedium<T> {
    /**
     * Pushes effect to the medium
     * @param effect any information for real handler
     */
    useMedium(effect: T): removeCb;
    /**
     * Assigns effect handler to the medium
     * @param {Function(effect: T)} handler effect handler
     */
    assignMedium(handler: MediumCallback<T>): void;
    /**
     * Assigns a synchronous effect handler to the medium, which would be executed right on call
     * @param {Function(effect: T)} handler effect handler
     */
    assignSyncMedium(handler: MediumCallback<T>): void;
    /**
     * reads the data stored in the medium
     */
    read(): T | undefined;
    options?: Record<string, any>;
}
export declare type DefaultOrNot<T> = {
    default: T;
} | T;
export declare type Importer<T> = () => Promise<DefaultOrNot<React.ComponentType<T>>>;
export declare type SideCarMedium<T = {}> = SideMedium<React.ComponentType<T>>;
export declare type SideCarHOC<T = {}> = {
    readonly sideCar: SideCarMedium<T>;
};
export declare type SideCarComponent<T> = React.FunctionComponent<T & SideCarHOC<T>>;
export declare type SideCarMediumOptions = {
    async?: boolean;
    ssr?: boolean;
};